Chemical Reactions and Reactivity
covalent bond
How do you identify an element? (You only need the number of what?)
the ability of a substance to be hammered or beaten into thin sheets
malleable
a subatomic particle that has NO charge and is located in the NUCLEUS of an atom
**BONUS 100 points, what other subatomic particle is located in the nucleus??**
neutron; protons are also located in the nucleus
name 2 chemical properties
flammability, reactivity, toxicity, pH, etc. (only need 2)
True or False: when balancing a chemical equation, can you adjust the subscripts in a formula?
False, only the coefficients
Why are metals good conductors?
electrons are able to move freely
What side of the periodic table are the nonmetals on?
right side (metals are on the left, separated by the metalloids in between)
What is the subatomic particle that has a negative charge, and WHERE are they located in the atom?
electron; electron cloud
alkali metals; only have one valence electron
Group 18, they possess a stable, complete outer electron shell
Why are alloys important?
make lightweight materials, can have specialized properties that the original metal wouldn't have
Elements that are in the same group have the same number of ______
Which part of the atom determines how an element interacts in a chemical reaction?
valence electrons
Name two physical properties
boiling point, melting point, density, volume, color, odor, solubility, viscosity, etc. (need 2)
anything in group 17 (F, Cl, I, etc.)
pH of an acid
0-6.9 (less than 7)
Why do elements in the same group have similar properties?
same # valence electrons
what is the atomic number of an element on the periodic table?
Define a scientific theory
theories are currently accepted to be true, but they might be refuted by new evidence
__Na + __MgF2 --> __NaF + __Mg
2, 1, 2, 1
What is the NFPA scale?
The National Fire Protection Association, scale is 0-4 to rank hazards of chemicals, 0 is minimal, 4 is extreme
the weighted average of the masses of all naturally occurring isotopes of an element
average atomic mass
how many electrons does it take to make an atom with 9 protons neutral?
9
You are measuring the volume of an object by placing it in a graduated cylinder with water. The original volume is 40 mL. When you put the object in, the liquid level becomes 80 mL. What is the volume of the object?
40 mL